Looking for high-performance ASME B16.5 slip-on flanges? As leading China suppliers and a certified factory, we provide loose-fit designs that relieve thermal stress and simplify installation for petrochemical and HVAC systems.
The Slip-On Flange (ASME B16.5) is a high-performance pipe fitting engineered for versatility and structural integrity. Consisting of a flange disc and a sleeve (lap joint stub end), it features a "loose-fit" design where the inner diameter of the disc is slightly larger than the pipe’s outer diameter. This innovative architecture allows the pipe to slide into the flange, ensuring a secure connection through bolt fastening and precision welding of the sleeve.
Designed specifically to handle industrial stress, the slip-on flange effectively compensates for axial expansion, contraction, and angular deflection. This makes it an indispensable component in systems prone to thermal fluctuations, significantly simplifying the installation process while reducing the risk of stress concentration in rigid piping networks across the petrochemical, HVAC, and marine sectors.
| Design Standard | ASME B16.5 (Class 150 to Class 2500) | Nominal Size (NPS) | 1/2" to 24" (Custom large diameters available) |
|---|---|---|---|
| Material Options | ASTM A105, A350 LF2, A182 F304/F316, F11/F22 | Sealing Face | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Carbon Steel Temp | Operating temperature ≤ 425℃ | Stainless Steel Temp | Operating range 270℃ to 816℃ |
| Alloy Steel Temp | High temp resistance above 600℃ (F22) | Angular Deflection | Supports up to ±3° angular adjustment |
| Axial Displacement | Supports up to ±5mm displacement | Quality Certification | ISO 9001, ASME U Stamp, PED 2014/68/EU |
The loose-fit structure relieves stress caused by thermal expansion and contraction, preventing pipe failure.
Only the sleeve requires welding, reducing the precision requirements for pipe alignment during assembly.
Reduces the use of expensive high-grade materials for large-diameter pipelines compared to integral flanges.
Simple disassembly by loosening bolts allows for quick gasket or flange replacement without cutting pipes.
Available in carbon, stainless, and alloy steels to suit corrosive, acidic, or high-pressure environments.
Strict UT non-destructive testing ensures zero internal porosity and full compliance with global standards.
Precision forging processes tracked to ensure structural density and mechanical strength.
Strict temperature control logs for normalizing and tempering to optimize material hardness.
100% inspection of diameters, thickness, and bolt hole positioning before shipment.
Ultrasonic Testing (UT) implemented to detect internal inclusions or porosity flaws.
Full MTR (Material Test Reports) provided for all carbon and stainless steel batches.
Adherence to ISO 9001 quality management systems for global export reliability.
| Comparison Factor | Slip-On Flange | Integral Welding Flange |
|---|---|---|
| Installation Speed | Very Fast (Easy alignment) | Slow (High precision needed) |
| Material Cost | Low (Optimized use) | High (Full grade material) |
| Thermal Stress | High Compensation (±3°) | Rigid (Low compensation) |
| Maintenance Cost | Low (Fast replacement) | High (Requires pipe cutting) |
| Overall ROI | Excellent for Large-Scale | Better for Extreme Pressure |
Slip-on flanges slide over the pipe and are welded both inside and outside, offering easier installation and lower cost, whereas weld neck flanges are butt-welded for higher pressure and stress resistance.
Stainless Steel (especially ASTM A182 F316) is recommended due to its superior acid and alkali resistance compared to carbon steel.
Yes, specifically Alloy Steel flanges (like F22) are designed to withstand temperatures exceeding 600℃, making them ideal for thermal power generation.
A Raised Face means the gasket surface is slightly elevated above the bolting circle, which concentrates more pressure on the gasket to ensure a tighter seal.
The loose-fit nature allows for slight angular and axial movement, which helps absorb vibration and impact loads during vessel navigation.
For global exports, you should ensure the products carry the ASME U Stamp, ISO 9001, and PED 2014/68/EU certification for European markets.
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